题目

武侯区某中学选拔一名学生参加区运动会的跳高项目，在10次测试中，甲、乙、丙、丁四名学生的跳高成绩的平均数均为1.6m，方差分别为： ＝0.48， ＝0.56， ＝0.52， ＝0.58，则这四名学生中成绩最稳定的是. 答案：【1】甲20．Mr Brown was going away for a week．Before he left，he said to his son，"If anyone asks for me，you can tell him that your father has been out for doing something，and will be back in a week，then be sure to ask him to sit down for a cup of tea．""OK，Dad，"said his son．But he was afraid his son couldn't remember this，he wrote these words down on a piece of paper and gave it to him．His son put it into his small pocket，took it out and looked at it every now and then．Four days passed，but no one came to see his father．The boy thought that there was no man to come and that the piece of paper was of no more use for him，so he burnt it that evening．The next afternoon，someone knocked at the door．The boy opened it．A man was standing at the door and said，"Where is your father？"The boy put his hand into his pocket at once and looked for the piece of paper．He could not find it．He suddenly remembered he had burnt it，so he shouted，"No more!"The man was very surprised．He asked，"No more？I met your father last week．When did it happen？""Burnt yesterday evening．"根据短文内容，选择最佳答案．36．Mr Brown told his son that．BA．he would be away from home for four daysB．he would be back in seven daysC．he would leave home in a monthD．he liked a cup of tea37．Mr Brown wrote the words down on．CA．the wall            B．the door            C．a piece of paper            D．his son's pocket38．The man came to the boy's house on．CA．the second day            B．the fourth day            C．the fifth day                        D．the seventh day            39．The man was very surprised because．AA．he thought the child's father was deadB．the child didn't ask him to sit downC．the child gave him a cup of teaD．he couldn't find that piece of paper40．The writer wrote this passage to make people．BA．excited            B．think deeply            C．feel angry            D．laugh．